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<br />. <br /> <br />. <br /> <br />CJ <br />~ <br />qc gage at Aguilar would have been 3.19 percent. An examination of <br />C) <br /> <br />the location of these stock ponds indicates that they are even <br /> <br />further removed from the stream than were those used in the Purga- <br /> <br />toire River studies. Therefore it is likely that the infiltration <br /> <br />effect downstream from these ponds would be even greater than <br /> <br />would be the case in the Purgatoire River Basin. It is the feel- <br /> <br />ing of the staff of the Colorado Water Conservation Board that it <br /> <br />is unlikely that the existence of these stock ponds significantly <br /> <br />affects the flows of the Apishapa River near Aguilar. <br /> <br />Several double-mass diagrams were prepared to see if <br /> <br />this approach would demonstrate a significant effect on river <br /> <br />flows. In each case no significant effect was observed. One <br /> <br />double-mass diagram is included as an exhibit of this report in <br /> <br />order to illustrate what a typical mass diagram will show. This <br /> <br />double-mass diagram plots Fountain Creek at Pueblo against the <br /> <br />Arkansas River near Pueblo. The period used was from 1941 to and <br /> <br />including 1959. It is interesting to note that there is a signi- <br /> <br />ficant change in slope between the years 1948 and 1956. This <br /> <br />change in slope is not due to the construction of stock ponds since <br /> <br />the total capacity of the stock ponds constructed upstream from <br /> <br />the Fountain Creek at Pueblo gage amounted to only 58 acre-feet. <br /> <br />Some phenomena other than stock ponds caused this significant <br /> <br />change in relationship. Although the period of record from 1956 <br /> <br />-6- <br />